Brake booster hissing after the engine is turned off

[Bobby4Puma]

Hello guys , the brake booster is hissing after i turn off the engine. Brakes are fine while driving. Also when im coasting in neutral the idle sits higher than usual and revs are going up and down 1300-1600 rpm. No leaks on the manifold side . No hissing while driving... Check valve gone bad? That can cause for the engine to act erratic? Cheers

 

[DOH]

Sounds like the rubber seal around where the vacuum hose assy fitment goes into the servo is faulty or split/torn. Remove and inspect it.

 

[Bobby4Puma]

I just did that earlier...when i moved it while the engine was running i could hear the leak...i put some silicone around it...cheers